31145453173 has 2 divisors, whose sum is σ = 31145453174. Its totient is φ = 31145453172.

The previous prime is 31145453153. The next prime is 31145453191. The reversal of 31145453173 is 37135454113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17672511844 + 13472941329 = 132938^2 + 116073^2 .

It is an emirp because it is prime and its reverse (37135454113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31145453173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31145453113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572726586 + 15572726587.

It is an arithmetic number, because the mean of its divisors is an integer number (15572726587).

Almost surely, 2^31145453173 is an apocalyptic number.

It is an amenable number.

31145453173 is a deficient number, since it is larger than the sum of its proper divisors (1).

31145453173 is an equidigital number, since it uses as much as digits as its factorization.

31145453173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 37.

The spelling of 31145453173 in words is "thirty-one billion, one hundred forty-five million, four hundred fifty-three thousand, one hundred seventy-three".